Week 10

DIAMOND

Adjust Your Underground Drawing As Needed Carefully work out your drilling, blasting and mucking cycle – Presumably you will blast at the end of the shift so that fumes can we diluted out over-night – Design your blasting round including hole size – charges and depth of round – Estimate the time it will take your drill to drill the round What are your people doing during this time? – If you answer they will go down and muck on the other level – do you have separate equipment down there? Remember you don’t have a ramp for equipment to move from one level to the next, and it is unlikely the equipment can be moved from one level to the next fully assembled. – What is your explosive? How will you load it? Do you have the equipment and manpower you will need to load? How long will it take to load? – Draw out your mucking machine and truck in the configuration they will be for loading- show that they have the maneuvering room they need to function Estimate the cycle time to load a truck How long will it take a loaded truck to take its load to the dump point and return? If you will have more than one truck it is unlikely both trucks can go down a 20 ft wide drift at the same time – one will have to pull out before the next can pull in – How long will the mucker sit idle while trucks are being changed out? – Draw out step by step where equipment will be during a cycle and include the time – It is suspected that these questions will cause you to make some layout modifications

Draw Out Your Hoist In Detail Show me a top view of how your 40 ft shaft will be divided into different compartments Draw your skips and man, and Equipment/materials cages with fully dimensioned drawings. – Check to see if all your equipment can just drive into the cages (I expect the answer is no and you will have to do final assmembly underground). What kind of hoist will you have? Calculate the time for your hoisting cycle – (it is expected this will be different for men vs. materials) Figure your horsepower requirements at all cardinal points of the hoisting cycle Select your equipment for hoist motors and speed control Draw out your headframe area in detail.

The Number of Cuts You Have Open Will Likely be similar over the mine life Create a mesh for your ventilation system Simulate your ventilation and find the pressure drops Size your fans and fan motors

Start Your Capital and Operating Cost List Make a list of every major piece of equipment or building, or fence, or tower that you will buy and put beside it – The cost for it to be purchased, set-up, and operational at your mine site – The years of life it will have until it must be replaced – Its operating cost per ton or per hour (not including the operator)

Check Your List for Completeness Is there anything you see that is missing? – Example Do you have fuel storage tanks? Did you include the heating system for your buildings? Did you put in the onsite power lines you need? What kinds of miscellaneous or support equipment do you need that is not included? – Examples Your machine shop probably needs a collection of hand tools, ladders, and maybe an overhead crane. Get your list complete

Check Contracted Services Make a list of services you are contracting – Provide a good description of the service – Indicate the annual cost of the service (or other basis if cost per year is not a logical unit)

You Have a Manning List List each man Beside the man indicate the annual or hourly salary (you are planning for most people to work 8 months per year – yet you need to offer a competitive over-all salary (if they starve during winter around Christmas time you could see a lot of turn-over). – What is your plan for employees in the “off season” Are you going to buy condo’s in warm tropical places and give them all a vacationing allowance 4 months per year? – for 45 people you might just be able to do it. Indicate what fringe benefits you will pay and what the cost of each benefit is

Work on Revising Your Midterm Write Up Since the work load this week is not too large – revise the write-up this week In the weeks ahead we will have you do your final economic analysis and write-up – If things are complete enough you may be done in about 3 weeks. (we’ll see).

COAL

Catch Up Work from Last Week With timing and rock cutting done you are in a position to develop a royalty payment schedule and to quantify the dilution rock tonnage going to the prep plant each year Develop your tonnage and timing for the #7 seam mining while the met coal is being produced

Vent Catchup and Extension You had attempted to pick three critical points for your ventilation simulation – Your short distance point is ok – For Your intermediate point instead pick a far area off the submain on your shaft side of the fault – For your distant point pick the most distant point on the other side of the fault so that you simulate the impact of the fault crossing. – Include on your mine map drawings of where the air is flowing for your simulations. – Explain how you handled leakage in your network and what sources you used to estimate leakage through stoppings and other places Make sure your ventilation models include ventilation of battery barns and repair areas – Develop drawing of your vent shafts including anything that you put in the vent shaft – Provide final sizing and settings on your fans Include a diagram showing the mine characteristic curve and where it intersects the fan curve Determine efficiencies, blade settings and horsepowers Determine whether one fan will serve the whole mine life or whether changes will be great enough that you cannot use just one fan – how about motors? Will they have to be changed.

Model Your Water Pumping You have estimated the water produced by water sprays. For #6 and #7 – Some of this water will go out with the coal – Some will adsorb into the floor – Assume 40% will run-off into sumps Assume in most the mine other water sources will be negligible except – When you are within 150 ft of the fault you will get 0.1 GPM per square foot of open area

Water Pumping For #2 – Assume 50% of your spray water runs off – When you are within 300 ft of the fault your water flow rate is 0.2 GPM per exposed square foot – When you are close enough to a water channel that you have sandstone roof you will have a 0.15 GPM per exposed square foot flow

Water Pumping Estimate the water load and pick the pumps and pipes you will need including pumps and pipes for the lift to the surface. – Run simulations to prove out your pipe, pump, and motor size using Slysel.

Belt Work Have a mine-wide drawing for every 5 years showing where each belt and its associated drives are. – Make sure you have Belt Analyst data for your appendix defending the design.

Start Your Capital and Operating Cost List Make a list of every major piece of equipment or building, or fence, or tower that you will buy and put beside it – The cost for it to be purchased, set-up, and operational at your mine site – The years of life it will have until it must be replaced – Its operating cost per ton or per hour (not including the operator)

Check Your List for Completeness Is there anything you see that is missing? What kinds of miscellaneous or support equipment do you need that is not included?. Get your list complete

Check Contracted Services Make a list of services you are contracting – Provide a good description of the service – Indicate the annual cost of the service (or other basis if cost per year is not a logical unit)

You Have a Manning List List each man Beside the man indicate the annual or hourly salary Indicate what fringe benefits you will pay and what the cost of each benefit is

Mine Safety and Health Pick your self rescue, miner tracking and refuge chambers. – Indicate where things will be in the mine every 5 years – Compile the cost.

Write Up This will be your last week for getting your midterm write-up ready for resubmission. Be ready by Friday – next week.

COPPER GOLD

Explain Your Process Not all mined material will meet cut-off grade Identify processes and recoveries for low grade ore Show an example of a break-even cut-off grade calculation for one of your sulfide and oxide ore Show an example of how that ore would be processed, what would be recovered and what it would cost – Show what the break-even cost is for your secondary process

Prepare an Appendix Prepare an Appendix showing how your got each of the numbers used in the economics matrix of MSOPIT – Remember an appendix is a mini-report that explains what is done and how it is calculated, shows example calculations, provides results tables if that is most applicable and explains what the results were that were used in other parts of the report. It is not a sketch and table core dump. – Give explanations of how you got the number in your oral report and turn the appendix in afterwards.

Run MSOPIT Get the Ultimate Pit – Identify the tonnage of each type of ore in the pit – Identify the amount of ore going to each process – Identify the total waste tonnage – Using your processing mass balance identify the total quantity of processing waste. Finalize your mine equipment fleet and processing plant sizes

Provide Mine Site 3D Drawings Of your mines waste dump Of your leach pad and preg ponds Of your tailings pond Obviously these are end of mine life drawings since you will not have done your stage pits yet

Show Drawings of Your Ancillary Facilities Offices Change Houses Warehouses Equipment Shops Other ancillary facilities you have that are not named Provide drawings of your ore storage and blending areas and your processing plants

Prepare a Capital and Operating Cost List List your capital cost items and their cost List the Operating Costs for Your equipment Prepare a manning table with salaries and benefits Check your lists for completeness